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<div class=”d4p-bbp-quote-title”>MountainBiker wrote:</div>I’ll add that ice will also be weaker if it isn’t directly on top of water. Sometimes a pond or lake level will drop during the winter and there will be a layer of ice from earlier in the season sitting on air.

Or the ice will crack and water infiltrates under a snow cover. You can be traveling on top of the snow and dig a hole only to watch water gush up. Its a bit disconcerting. Its so cold you know the ice is there but you still hit water. Thats on a dam reservoir. The water goes up and the water goes down.